Study of curing kinetics of anhydride cured petroleum-based (DGEBA) epoxy resin and renewable resource based epoxidized soybean oil (ESO) systems catalyzed by 2-methylimidazole

• Published in: Thermochimica acta 2017-08, Vol.654, p.112-120
• Main Authors: Kumar, Sudheer, Samal, Sushanta K., Mohanty, Smita, Nayak, Sanjay K.
• Format: Article
• Language: English
• Subjects: Activation energy; Bio-resin (ESO); Curing agent (MHHPA); Petroleum-based (DGEBA) epoxy resin
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2017.05.016

[Display omitted] •Non-isothermal curing kinetics of diglycidyl ether of bisphenol-A (DGEBA), bio-based epoxy resin (ESO) and their optimized blend cured with MHHPA were studied.•Higher heat of reaction was observed in blend system.•Kinetic parameters were determined by Kissinger–Malek, Flynn–Wall–Ozawa method and Sestak–Berggren autocatalytic model.•Predicted values obtained using Malek method was found to be matched with the experimental data for DGEBA, ESO and their blend. The non-isothermal curing kinetics of diglycidyl ether of bisphenol-A (DGEBA) and bio-based epoxy resin (ESO) both cured with methyl hexahydrophthalic anhydride (MHHPA) curing agent in the presence of 2-methylimidazole as catalyst (2-MI) was investigated using differential scanning calorimetry (DSC) at three different heating rates 5, 10, 15°C/min. The peak temperature was found to be dependent on the heating rates and the structure of anhydride as well as molar ratio of epoxy groups to MHHPA and catalyst. The activation energy (Ea) was determined by Kissinger and Ozawa methods. The two kinetic parameter m and n were obtained by Sestak–Berggren autocatalytic model. The curve obtained by the predicted values of the non-isothermal Malek method matched perfectly with the experimental data for DGEBA, ESO and their blend.